OBJECTIVE -To assess the social-cognitive, behavioral, and physiological outcomes of a self-management intervention for youth with type 1 diabetes.RESEARCH DESIGN AND METHODS -A total of 81 youth with type 1 diabetes aged 11-16 years were randomized to usual care versus a "diabetes personal trainer" intervention, consisting of six self-monitoring, goal-setting, and problem-solving sessions with trained nonprofessionals. Assessments were completed at baseline and multiple follow-up intervals. A1C data were obtained from medical records. ANCOVA adjusting for age and baseline values were conducted for each outcome.RESULTS -At both short-term and 1-year follow-up, there was a trend for an overall intervention effect on A1C (short-term F ϭ 3.71, P ϭ 0.06; 1-year F ϭ 3.79, P ϭ 0.06) and a significant intervention-by-age interaction, indicating a great effect among older than younger youth (short-term F ϭ 4.78, P ϭ 0.03; 1-year F ϭ 4.53, P ϭ 0.04). Subgroup analyses demonstrated no treatment group difference among younger youth but a significant difference among the older youth. No treatment group differences in parent or youth report of adherence were observed.
CONCLUSIONS
It is well-established that a deterioration in glycemic control accompanies adolescence (1), in part due to hormonal changes associated with puberty (2) but also resulting from worsening adherence (3,4). Consequences include hospitalizations and even mortality from diabetic ketoacidosis (5) and physical damage leading to later complications (6). Because diabetes management during childhood is associated with adult behavior and health outcomes (7,8), intervention to enhance diabetes self-management skills may be critical in decreasing the rate of physical health problems throughout the lifespan.Optimal diabetes management is a formidable undertaking for youth, who are still maturing cognitively and socially. Typically, self-management skills are not well developed, and evaluation of behavioral options and consequences may be inadequate. Despite concerns regarding readiness for diabetes management responsibility, increased independence from parents often results in youth assuming additional responsibility at the cost of poorer adherence.The development of effective intervention models during this transitional period is critical and may be facilitated by predominant theoretical perspectives. Social cognitive theory (9) emphasizes the reciprocal relationship of beliefs and social/environmental factors. One's outcome expectations (expected positive and negative outcomes of behaviors) and selfefficacy (perceived ability to perform behaviors) develop from experience, are influenced by cognitive and behavioral skills, and affect subsequent behavior (10,11). These beliefs provide the underpinnings for motivation and selfmanagement processes, as emphasized by the self-regulation model (12), which explains health-related behavior as a function of appraisal of the situation, perceived choice of actions, and evaluation of the outcomes of those actions (13,14). ...